* This replaces the iana binary tzdb with the source tzdb as the
  default. This is because this is what's supported most comprehensively
  by the date package. This still retains the option to build the binary
  database if required.

Closes conan-io#21670

* Swap the quotation characters in the python string to read the source
  database to enable the command to be parsed correctly on Windows

This file is parsed by windows to convert local timezone mappings to
that of the IANA database. It's necessary to use the source version of
the database on windows.

…data

* Options can't be queried in the source() method, so remove this and
  just always download windowsZones.xml

Conan 1.x is not able to parse self.dependencies in the test() method
due to differences in the lifetime of objects. The solution presented
here is to save the necessary options to file and load them back again
in the test() method to be used as appropriate.

Additionally, utilise the conan `save` and `load` methods for
readability and consistency with other recipes.

Co-authored-by: Martin Valgur <martin.valgur@gmail.com>

* Explain where file listing for tzdata has come from, including
  windowsZones.xml, which is managed by CLDR.

This reverts commit a89ec20.